Abstract: There is provided a risk-free and easy-to-use battery pack using battery cells 1 as a secondary battery, in which internal gases evaporated by applying overvoltage or the like thereto are processed inside a case to be prevented from leaking to the outside of the case and thereby even if the case has been led to rise in pressure due to a thermorunaway of the battery, the case is free from breaking. To realize this performance, the battery pack 10 is provided with a battery cell housing 17 for housing lithium cells 1 and a gas processor 15 for liquefying the internal gases g generated from the lithium cells 1.

Abstract: There is provided an uninterruptible power supply system capable of preventing life shortening of a lithium-ion secondary battery attributable to its overcharge over the whole period of its use. At the start of use of the lithium-ion secondary battery 22, a charging voltage is set comparatively low. On the other hand, as the lithium-ion secondary battery 22 comes closer to an end of its life, its charging voltage becomes higher. A charging control means 37 variably sets the charging voltage applied to the lithium-ion secondary battery 22 so as to realize a discharge duration thereof may become slightly longer than a backup time required for the system and hence life shortening of the lithium-ion secondary battery 22 attributable to overcharge can be prevented.

Abstract: There is provided a digital controller which can generate no oscillation even if sensing a load side and enables control of supplying a desired voltage to the load. In an power amplifier which supplies an output voltage vo to the load connected via a load connecting line, a load voltage vL and the output voltage vo are periodically sampled to calculate a manipulating variable ?1 from the output voltage vo, the load voltage vL and an arbitrary target value r. Based on the manipulating variable ?1 calculated, a control signal is output to the power amplifier. As a result, when connecting an LC filter with a load device 9 of the power amplifier intended for a control target and besides the load connecting line is long, a robust digital controller without generating oscillation even if sensing the load side is performed can be realized.

Abstract: A battery cell 101 has an internal structure where after building up an assembled unit by stacking positive-and negative-electrode materials 110, 111 and a separator 112 in some layers, the assembled units, together with an electrolyte, are sealed with aluminum laminates 114, 114. The battery pack 1 comprises cell assemblies 102 formed by stacking one on top of another in a plurality of the battery cells 101. A deformation-preventive plate 2 is inserted into a portion between each of the battery cells 101 stacked. The cell assemblies 102 inserted by the deformation-preventive plates 2 between each of the battery cells are pressed by cell assembly pressing plates 3, 3 from the upper and lower sides of the battery assemblies. The cell assemblies 102 are pressed by the cell assembly pressing plates 3, 3 to be subjected to some degree of pressure. Hence, the cell assemblies 102 expand not largely to be maintained as an approximately the same form as that at a normal time.

Abstract: There is provided an uninterruptible power supply system capable of preventing life shortening of a lithium-ion secondary battery attributable to its overcharge over the whole period of its use. At the start of use of the lithium-ion secondary battery 22, a charging voltage is set comparatively low. On the other hand, as the lithium-ion secondary battery 22 comes closer to an end of its life, its charging voltage becomes higher. A charging control means 37 variably sets the charging voltage applied to the lithium-ion secondary battery 22 so as to realize a discharge duration thereof may become slightly longer than a backup time required for the system and hence life shortening of the lithium-ion secondary battery 22 attributable to overcharge can be prevented.

Abstract: Without shortening clock pulse duration serving as a unit time of a pulse generator, a pulse-width control is possible in which pulse duration varies in increments of a time length shorter than the unit time. A time width Ton_s of a pulse width finely dividing signal Vs from a DSP 17 varies by clock pulse duration Tclk in response to variations in an output voltage Vo. A time control circuit 18 that has received the pulse width finely dividing signal Vs generates, in a control signal Vd, varying segments 30, 31 for making the time width of the pulse drive signal Vg vary by a shorter time ?Td than the clock pulse duration Tclk. Consequently, resolution of the time width of the pulse drive signal Vg is improved so as to be higher than the clock pulse duration Tclk, which is time resolution of the DSP 17 itself.

Abstract: Without shortening clock pulse duration serving as a unit time of a pulse generator, a pulse-width control is possible in which pulse duration varies in increments of a time length shorter than the unit time. A time width Ton_s of a pulse width finely dividing signal Vs from a DSP 17 varies by clock pulse duration Tclk in response to variations in an output voltage Vo. A time control circuit 18 that has received the pulse width finely dividing signal Vs generates, in a control signal Vd, varying segments 30, 31 for making the time width of the pulse drive signal Vg vary by a shorter time ?Td than the clock pulse duration Tclk. Consequently, resolution of the time width of the pulse drive signal Vg is improved so as to be higher than the clock pulse duration Tclk, which is time resolution of the DSP 17 itself.

Abstract: A switching power supply which feeds energy stored in a choke coil 7 to a load 11 through a freewheeling element when a switching element 2 turns off. The switching power supply includes a freewheeling MOSFET 6 serving as the freewheeling switch element which operates synchronously with the switching element 2 and a surge voltage prevention circuit 32. The surge voltage prevention circuit 32 detects a timing for a current to flow in the direction that a body diode 16 of the freewheeling MOSFET 6 conducts when an operation stoppage signal to the switching element 2 is outputted, and then turns off the freewheeling MOSFET 6 at the timing.

Abstract: A series circuit of a primary winding 1 A of a transformer 1 and a switching element 2 is coupled to a DC source 3 and a voltage induced in a secondary winding 1B of the transformer 1 according to switching operation of the switching element 2 is rectified and smoothed by a rectifier smoothing circuit 9. Further, a Zener diode 21 is coupled across the switching element 2 with reverse polarity to the switching element 2. The Zener diode 21 may be coupled across a rectifier diode 5 which conducts during the ON period of the switching element 2.

Abstract: A current mode DC/DC converter provided with a current mode control circuit 51, serving as a feedback circuit for stabilizing an output voltage Vo supplied to a load resister RL, which detects a coil current I2 flowing through a choke coil L1 and control switching operation of a switching element Q1 according to a result of comparison between a detection signal of the coil current I2 and an error signal from an error amplifier A1 serving as a reference signal. The current mode control circuit 51 is provided with a feed forward circuit 41 which detects a variation in a load current Io flowing through a load resister RL and adds the variation to the detection signal of a coil current I2. Accordingly, a switching pulse, by which the coil current I2 changes quickly in response to an abrupt change in the load current Io, can be fed to the switching element Q1.

Abstract: An on-board mounting electronic apparatus including an apparatus body 6, made up of a main board 4 and terminal pins 5 for connection with a circuit board 21. The terminal pins 5 extend from an underside of the main board 4. A heat dissipation plate 8 is arranged on an upper surface of heat generating components 2 mounted on the main board 4. The heat dissipation plate 8 is thermally connected with the surface of the heat generating components 2. Such structure may be applied to an on-board mounting electric power supply as well.

Abstract: A switching power supply for preventing the inflow of an electric current from an external when it stops operating. A transistor 32 is connected between a gate of a MOSFET 11 and a first terminal of a secondary winding 7 where a positive voltage is induced when a switching element 8 turns on. A Zener diode 33 is connected to a base of the transistor 32. When the switching element 8 is in an on state, the Zener diode 33 turns on the transistor 32 by a voltage Vson generated in the first terminal of the secondary winding 7, thereby supplying the voltage Vson to the gate of the MOSFET 11.

Abstract: A switching power supply which includes a sychronous rectifier circuit that performs sychronous rectification with a main switching element by using rectifying switching elements. When a current begins to flow into the rectifying switching element 6, the rectifying switching element 6 builds up rapidly by the voltage induced in the auxiliary winding 21 of low impedance. Accordingly, the rectifying switching element 6 turns on rapidly at a point showing an approximately maximum current so that the ON-state resistance of the rectifying switching element 6 can be smaller. The voltage induced in the auxiliary winding 21 is fed directly as a drive signal of the rectifying switching element 6 so that the drive signal is not influenced by an output voltage.